I think that is depending on the application support the newly defined
UTF8_STRING for selection or not.
The Linux verion of mozilla implement it so it can copy/paste with the
recent version of xterm w/o problem

>After searching far and wide and reading all the HOWTOs etc.
>I'm still at a loss as to how to make a simple copy/paste
>work within xterm and between xterm and XEmacs.
>
>If I cat a utf-8 encoded XML file containing Russian and it
>displays just fine. If I select a single word by left
>double clicking and paste with a middle click I see a
>mixture of '@', '^' and a few Cyrillic characters.
>If I paste into XEmacs 21.4 in a buffer with the buffer
>file coding system set to utf-8 I see a string of '?'.
>
>Interestingly I can paste the selection into Windows
>Notepad and Word and it displays just fine too.
>
>Am I missing something very basic in my configuration/setup
>or is this a known problem? I'm wondering whether my
>X server is not up to the task or perhaps are there
>some x resources I should be setting?
>
>I am running the xterm XFree86 4.2.0(165) that comes
>with Linux Redhat 8 with display support from Hummingbird
>eXceed X Server 7.1 on Windows NT 4.0 and XEmacs 21.4 (patch 8)
>"Honest Recruiter" [Lucid] (i386-redhat-linux, Mule)
>of Mon Aug 26 2002 on astest.
>
>I'm invoking xterm as:
>
>xterm -u8 -fn
>'-misc-fixed-medium-r-semicondensed--13-120-75-75-c-60-iso10646-1'
>
>% locale
>
>LANG=en_US.UTF-8
>LC_CTYPE=en_US
>LC_NUMERIC="en_US.UTF-8"
>LC_TIME="en_US.UTF-8"
>LC_COLLATE="en_US.UTF-8"
>LC_MONETARY="en_US.UTF-8"
>LC_MESSAGES="en_US.UTF-8"
>LC_PAPER="en_US.UTF-8"
>LC_NAME="en_US.UTF-8"
>LC_ADDRESS="en_US.UTF-8"
>LC_TELEPHONE="en_US.UTF-8"
>LC_MEASUREMENT="en_US.UTF-8"
>LC_IDENTIFICATION="en_US.UTF-8"
>LC_ALL=
>
>Phil.
>---
>Phillip Farber, Information Retrieval Specialist
>Email: pfarber@umich.edu>Digital Library Production Service (http://www.umdl.umich.edu/)
>Hatcher Graduate Library, University of Michigan
>308 Hatcher North, Ann Arbor, MI 48104-1205
>
>
>
>
>
>